Glashütte Original · SeaQ

Strap for SeaQ Date Stainless Steel / Black / Synthetic - Folding

Takes 20 mm straps. Verified lug width, the straps that fit this model, and answers to the most common questions.

Lug width20 mm
Case diameter40 mm
Reference1-39-11-06-80-34
FamilySeaQ
MovementGlashütte Original caliber 39-11 Hours, Minutes, Seconds | Date
CaseStainless Steel

Spring bar

Swiss Standard universal spring bars

The right category for this model · 316L steel, all lug widths 13–26 mm

Straps for the SeaQ 1-39-11-06-80-34

Selected for the 20 mm lug width · workshop selection

All 20 mm straps →

The SeaQ 1-39-11-06-80-34, seen from the bench

The Glashütte Original SeaQ features the automatic caliber 39-11 with hour, minute, second and date indications. The watch has 20mm lugs and an in-house manufactured movement. The reference 1-39-11-06-80-34 belongs to the brand's diving watch collection.

Frequently asked questions

What is the lug width of the Glashütte Original SeaQ 1-39-11-06-80-34?

The SeaQ lug width is 20 mm. Measure using a digital calliper positioned between the inner pins of the case: this specification is critical for selecting the correct aftermarket strap and ensuring proper proportions between the 39.50 mm case and your wrist.

Which strap would you recommend for the SeaQ 1-39-11-06-80-34?

We recommend Mississippi alligator in black or dark brown for formal wear, vegetable-tanned calf for durability, or Cordura NATO for full water resistance. The satin-finished 39.50 mm case requires neutral straps that do not compete visually with the instrument-watch design language.

How do I change the strap on a watch with 20 mm lug width?

Use a spring bar tool to compress the lateral attachment pins. Insert the flat tip into one of the case's side holes, gently push toward the centre and lift the lug. Repeat on the opposite side. Reverse the procedure to install the new strap.

Can I use a 20 mm aftermarket strap on other watches?

No. The 20 mm lug width is specific to the 39.50 mm Glashütte Original SeaQ case. Other models (even from the same manufacture) may feature different widths (18 mm, 22 mm). Always verify your watch reference before purchase.

How long does a leather strap last on a diving watch?

An alligator or vegetable-tanned calf strap lasts 3–5 years under normal conditions. Frequent exposure to salt water or chlorine accelerates ageing. For regular diving use, we recommend NATO or vulcanised rubber. Natural patina in leather is a mark of authenticity, not deterioration.

The next step

The right strap isn't chosen. It is built, together.

From the atelier appointment to delivery, every step is made for those who know that things done well take time. Rare leathers, one piece at a time, eighteen months of warranty.

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Casati Milano · Via XX Settembre 15, Milan · by appointment only